The American Red Cross is running a blood drive and Karen has decided to donate blood. The process consists of four steps: registration (10 minutes), medical history and mini-physical (30 minutes), blood donation (12 minutes), and refreshments (10 minutes). Donors wait 5 minutes on average between registration and their medical history/mini-physical and 3 minutes between their medical history/mini-physical and blood donation. What is the average throughput time for the blood donation process